Python3 From Zero——{最初的意识：015～初级实例演练}

#!/usr/bin/env python3
#-*- coding:utf-8 -*-
color_0="\033[41m \033[00m"
color_1="\033[46m \033[00m"
def line(a, b):
    for i in range(0,48):
        if ((i // 8)  % 2) == 0:
            print(a, end=‘‘)
        else:
            print(b, end=‘‘)
for x in range(0, 24):
    if ((x // 4) % 2) != 0:
        line(color_0, color_1)
    else:
        line(color_1, color_0)
    print(‘\n‘, end=‘‘)

#!/usr/bin/env python3
#-*- coding: utf-8 -*-
#Author: fanhui
num = input("Please input a number: ")
num_sqrt = round(float(num)**0.5, 4)
print(num, "‘s sqrt is ", num_sqrt, sep=‘‘)

f@z ~/py_script $ python3 num_sqrt.py 
Please input a number: 10
10‘s sqrt is 3.1623

#!/usr/bin/python3
#-*- coding: utf-8 -*-
import cmath
num = input("Please input a negative num: ")
negative_sqrt = cmath.sqrt(float(num))
print(negative_sqrt)

f@z ~/py_script $ python3 negative_sqrt.py 
Please input a negative num: -4
2j